Fig. 3: Typical synaptic behavior of artificial synapse.
From: Optical synaptic devices with ultra-low power consumption for neuromorphic computing
a Schematic diagram of optical signal for photonic artificial synapse. b Photo-activated postsynaptic current (−ΔPSC) of the artificial synapse at Plight = 11.97 μW cm−2 and VG = 0 V with light pulse width at 50 ms. Inset: −ΔPSC with longer monitoring time, it remains well after 5000 s. c −ΔPSCs under different light pulse width at a fixed Plight of 11.97 μW cm−2, VD = 0.5 V, and VG = 0 V. d −ΔPSCs under different Plight at a fixed light pulse width of 50 ms (VD = 0.5 V, VG = 0 V). e The programming and erasing process of persistent PSC by light pulse and positive VG pulse. f LTP/LTD characteristics trained by 20/50/100 consecutive potentiation pulses and 20/50/100 depression pulses. Potentiation process: light pulses; illumination time, 5 ms; light power, 0.16 μW cm−2. Depression process: electrical spikes; pulse time, 5 ms; voltage amplitude, uniformly increasing gate voltage from 0 to 4 V. g The summary of energy consumption in single photonic programming process (Elight) of artificial photonic synapses with different architecture
